I haven't tried it with the VGA adapter, but if your iPad supports video mirroring, it ought to work: (from the release notes)
Quote:
User Interface
OmniFocus takes advantage of hardware screen mirroring when available.
When mirroring your iPad 2 on a secondary display, OmniFocus now shows your gestures—taps, pinches, swipes, and all—so that your viewers can follow along.
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I do the video mirroring through my AppleTV 2 with my iPad 2 on occasion and have had no problems. No substitute for trying it out yourself and making sure it works with your gear before the big presentation, though!